Monthly outlook for Harness, IL: average high 66.7°, average low 50°. That is 1.5° above the climate normal for October. Precipitation is expected on 5 days (about 1.1 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 12 October (88.2°), the coolest 18 October (32.5°).
66.7°/50°
Average high / low
+1.5°
Above normal
5 / 5
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
69°
65°
+2.2°
20 October – 29 October
62.8°
61.2°
+0.9°
30 October – 8 November
at normal
56.9°
—
October records over 66 years
89.4°7 October 2007All-time high
21.9°22 October 1976All-time low
Climate normals and records are computed from the nearest reference point — Broadwell (15 mi).
Sun, 1182° / 53°0
82 °
Harness, Sunday, 11 October
Clear. High 82°, low 53°.
Pressure29.97 inHg
Wind3 mph S
Humidity53%
Visibility6.2 mi
Dew point56°
Mon, 1288° / 65°0
88 °
Harness, Monday, 12 October
Mostly clear. High 88°, low 65°.
Pressure29.85 inHg
Wind11.8 mph SW
Humidity46%
Visibility6.2 mi
Dew point61°
Tue, 1386° / 73°0
86 °
Harness, Tuesday, 13 October
Clear. High 86°, low 73°.
Pressure29.85 inHg
Wind9.1 mph W
Humidity54%
Visibility6.2 mi
Dew point65°
Wed, 1473° / 65°0.24
73 °
Harness, Wednesday, 14 October
Light rain. High 73°, low 65°.
Pressure30.06 inHg
Wind14 mph NE
Humidity68%
Visibility—
Dew point60°
Thu, 1561° / 56°0.53
61 °
Harness, Thursday, 15 October
Rain. High 61°, low 56°.
Pressure30.30 inHg
Wind13.3 mph NW
Humidity88%
Visibility—
Dew point53°
Fri, 1667° / 52°0
67 °
Harness, Friday, 16 October
Overcast. High 67°, low 52°.
Pressure29.97 inHg
Wind17.4 mph W
Humidity35%
Visibility—
Dew point37°
Sat, 1748° / 39°0.04
48 °
Harness, Saturday, 17 October
Light rain. High 48°, low 39°.
Pressure30.21 inHg
Wind16.8 mph NW
Humidity88%
Visibility—
Dew point37°
Sun, 1849° / 33°0
49 °
Harness, Sunday, 18 October
Clear. High 49°, low 33°.
Pressure30.47 inHg
Wind13.5 mph N
Humidity43%
Visibility—
Dew point24°
Mon, 1955° / 35°0
55 °
Harness, Monday, 19 October
Overcast. High 55°, low 35°.
Pressure30.42 inHg
Wind8.5 mph S
Humidity41%
Visibility—
Dew point27°
Tue, 2061° / 40°0
61 °
Harness, Tuesday, 20 October
Overcast. High 61°, low 40°.
Pressure30.30 inHg
Wind10.8 mph S
Humidity32%
Visibility—
Dew point26°
Wed, 2166° / 42°0
66 °
Harness, Wednesday, 21 October
Clear. High 66°, low 42°.
Pressure30.27 inHg
Wind11.2 mph S
Humidity30%
Visibility—
Dew point29°
Thu, 2271° / 47°0
71 °
Harness, Thursday, 22 October
Clear. High 71°, low 47°.
Pressure30.12 inHg
Wind15.8 mph S
Humidity31%
Visibility—
Dew point35°
Fri, 2356° / 50°0.21
56 °
Harness, Friday, 23 October
Rain. High 56°, low 50°.
Pressure29.97 inHg
Wind17.8 mph S
Humidity82%
Visibility—
Dew point49°
Sat, 2464° / 48°0.11
64 °
Harness, Saturday, 24 October
Light rain. High 64°, low 48°.
Pressure29.80 inHg
Wind16.6 mph NW
Humidity53%
Visibility—
Dew point44°
Sun, 2558° / 43°0
58 °
Harness, Sunday, 25 October
Mostly clear. High 58°, low 43°.
Pressure29.91 inHg
Wind16.5 mph W
Humidity43%
Visibility—
Dew point32°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2659° / 44°0.14
59 °
Harness, Monday, 26 October
Climate normal for this date — 60-year average.
Average high59°
Average low44°
Average precipitation0.14 in
Chance of precipitation32%
Record high82° (1963)
Record low24° (1962)
Tue, 2760° / 44°0.09
60 °
Harness, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high60°
Average low44°
Average precipitation0.09 in
Chance of precipitation32%
Record high77° (1984)
Record low31° (2001)
Wed, 2859° / 43°0.06
59 °
Harness, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.06 in
Chance of precipitation18%
Record high76° (1999)
Record low27° (1976)
Thu, 2959° / 43°0.08
59 °
Harness, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.08 in
Chance of precipitation27%
Record high79° (1971)
Record low25° (1980)
Fri, 3061° / 45°0.12
61 °
Harness, Friday, 30 October
Climate normal for this date — 60-year average.
Average high61°
Average low45°
Average precipitation0.12 in
Chance of precipitation30%
Record high80° (1971)
Record low25° (1980)
Sat, 3160° / 45°0.19
60 °
Harness, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high60°
Average low45°
Average precipitation0.19 in
Chance of precipitation42%
Record high77° (1968)
Record low28° (2019)
Sun, 0159° / 43°0.2
59 °
Harness, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.2 in
Chance of precipitation35%
Record high79° (2016)
Record low25° (1993)
Mon, 0257° / 42°0.08
57 °
Harness, Monday, 2 November
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.08 in
Chance of precipitation28%
Record high77° (1961)
Record low25° (1996)
Tue, 0356° / 41°0.11
56 °
Harness, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.11 in
Chance of precipitation30%
Record high77° (1987)
Record low18° (1991)
Wed, 0456° / 42°0.1
56 °
Harness, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.1 in
Chance of precipitation25%
Record high76° (1978)
Record low16° (1991)
Thu, 0556° / 41°0.15
56 °
Harness, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.15 in
Chance of precipitation30%
Record high77° (1978)
Record low19° (1991)
Fri, 0655° / 39°0.08
55 °
Harness, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.08 in
Chance of precipitation32%
Record high71° (2020)
Record low25° (1982)
Sat, 0755° / 39°0.07
55 °
Harness, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.07 in
Chance of precipitation22%
Record high71° (1966)
Record low18° (1991)
Sun, 0855° / 39°0.04
55 °
Harness, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.04 in
Chance of precipitation15%
Record high76° (1999)
Record low11° (1991)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Harness, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Harness, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.